Give the possible structure of X in the following reaction :
`C_6 H_6 + D_2 SO_4 overset(D_2 O) to X`

Options

A.
B.
C.
D.

Answer

To determine the possible structure of X in the reaction of benzene (C₆H₆) with deuterium sulfate (D₂SO₄) in the presence of deuterium oxide (D₂O), we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Reactants**:
- The reactants are benzene (C₆H₆) and deuterium sulfate (D₂SO₄).

2. **Understand the Role of D₂SO₄**:
- D₂SO₄ can dissociate into D⁺ (deuteron) and SO₄²⁻. The D⁺ acts as an electrophile in this reaction.

3. **Electrophilic Attack**:
- The D⁺ ion will attack the benzene ring. Benzene is a nucleophile due to its delocalized π electrons.

4. **Substitution Reaction**:
- In this electrophilic substitution reaction, the D⁺ replaces the hydrogen atoms in the benzene ring. Since benzene has six hydrogen atoms, all of them can be replaced by D⁺.

5. **Formation of the Product**:
- The product formed will be a fully deuterated benzene, where all hydrogen atoms in C₆H₆ are replaced with deuterium (D). The structure of the product is C₆D₆.

6. **Naming the Product**:
- The compound formed is called hexadeuterobenzene or hexa-deutero benzene.

### Final Structure of X:
The structure of X is:

```
D
|
D--C--D
|
D--C--D
|
D
```

This represents hexadeuterobenzene (C₆D₆).